Chip card with simultaneous contact and contact-less operations

ABSTRACT

A chip card receives and processes what-ever combination of contact data and contact-less data is available to allow multiple functionalities for the chip card. A micro-computer of the chip card is adapted to simultaneously receive and process contact data from a contact interface and contact-less data from a contact-less interface. In addition, the chip card includes a power voltage selector for selecting a contact bias to supply power to the micro-computer when-ever the contact bias voltage is available since the contact bias voltage is more stable than a contact-less bias voltage.

CROSS-REFERENCE TO RELATED APPLICATION(S)

The present application is a continuation of an earlier filed copendingpatent application with Ser. No. 10/852,610 filed on May 24, 2004, nowU.S. Pat. No. 7,246,750 for which priority is claimed. This earlierfiled copending patent application with Ser. No. 10/852,610 is in itsentirety incorporated herewith by reference.

The present application also claims priority under 35 USC § 119 toKorean Patent Application No. 2003-0062251, filed on Sep. 5, 2003, inthe Korean Intellectual Property Office, the disclosure of which isincorporated herein in its entirety by reference. A certified copy ofKorean Patent Application No. 2003-0062251 is contained in the parentcopending patent application with Ser. No. 10/852,610.

TECHNICAL FIELD

The present invention relates generally to chip cards (i.e., “smartcards”), and more particularly, to a chip card having a contactinterface, a contact-less interface, and a micro-computer adapted forsimultaneous contact and contact-less operations.

BACKGROUND OF THE INVENTION

Chip cards or IC (integrated circuit) cards (also commonly referred toas “smart cards”) by now are prevalently used in many applications suchas for authentications, banking transactions, and payments. FIG. 1 showsa chip card 102 of a contact type according to the prior art. For such achip card 102, a contact bank 104 and an IC (integrated circuit) chip106 are formed onto a substrate 108 typically with a shape similar to acredit-card, according to ISO standards as known to one of ordinaryskill in the art. The contact bank 104 has a plurality of contacts 110,each receiving a respective signal, such as a supply voltage, a clocksignal, or data, from a contact based terminal. The IC chip 106processes data from such signals received by the contact bank 104 aftermaking contact with the contact based terminal.

FIG. 2 shows a chip card 112 of a contact-less type according to theprior art. For such a chip card 112, at least one antenna coil (a firstantenna coil 114 and a second antenna coil 116 in the example of FIG. 2)and an IC chip 18 are formed onto a substrate 120 typically with a shapesimilar to a credit-card, according to ISO standards as known to one ofordinary skill in the art. The antenna coils 114 and 116 are inductivelycoupled to a corresponding antenna on a contact-less based terminal fortransmission of signals, such as a supply voltage, a clock signal, anddata. The IC chip 118 processes data from such signals received by atleast one of the antenna coils 114 and 116.

A disadvantage of the chip card 102 of the contact type in FIG. 1 isthat the contacts of the contact bank 104 are easily worn due tocareless treatment or to frequent contact with a terminal. Adisadvantage of the chip card 112 of the contact-less type in FIG. 2 isthat supply power provided to the IC chip 118 via inductive coupling tothe antenna coils 114 and 116 is unstable due to noise between the chipcard 120 and a contact-less based terminal.

FIG. 3 shows a chip card 122 of a combined type according to the priorart. For such a chip card 122, both a contact bank 124 and at least oneantenna coil (a first antenna coil 126 and a second antenna coil 128 inthe example of FIG. 3) in addition to an IC chip 130 are formed onto asubstrate 132 with a shape similar to a credit card, according to ISOstandards as known to one of ordinary skill in the art.

FIG. 4 shows components within the IC chip 130 for the chip card 122 ofthe combined type in the prior art. The IC chip 130 includes a signalselection unit 134 that inputs first signals received by the contactbank 124 and second signals received by at least one of the antennacoils 126 and 128. The signal selection unit 134 selects one of suchsignals to be processed by a micro-computer 136 of the IC chip 130. Themicro-computer 136 typically includes a data register 138 for storingdata during processing by the micro-computer 136.

The signal selection unit 134 selects one of the first or second signalsreceived by the contact bank 124 or at least one of the antenna coils126 and 128 depending on an assigned priority. FIG. 5 shows a flowchartof steps for operation of the IC chip 130 when contact-less operation isassigned higher priority over contact operation. In that case, uponpower-on (at step 140 of FIG. 5) of the IC chip 130, the signalselection unit 134 checks for availability of a RF voltage supply(RF_VDD) (at step 142 of FIG. 5). Such RF_VDD is derived from an RFsignal received by at least one of the antenna coils 126 and 128.

If such RF_VDD is available (at step 142 of FIG. 5), the signalselection unit 134 selects signals received by the antenna coils 126 and128 to be processed by the micro-computer 136. Thus, RF_VDD is selectedto supply power to the micro-computer 136 (at step 144 of FIG. 5), andthe data register 138 is reset (at step 146 of FIG. 5). RF data (RF_IO)derived from the RF signal received by at least one of the antenna coils126 and 128 is then processed by the micro-computer 136 (at step 148 ofFIG. 5) before power-off (at step 150 of FIG. 5) of the IC chip 130.

Further referring to FIG. 5, if RF_VDD is not available (at step 142 ofFIG. 5), the signal selection unit 134 selects signals received via thecontact bank 124 to be processed by the micro-computer 136. Thus, acontact voltage (CNT_VDD) received via the contact bank 124 is selectedto supply power to the micro-computer 136 (at step 152 of FIG. 5), andthe data register 138 is reset (at step 154 of FIG. 5). Contact data(CNT_IO) received via the contact bank 124 is then processed by themicro-computer 136 (at step 156 of FIG. 5) before power-off (at step 158of FIG. 5) of the IC chip 130.

FIG. 5 also illustrates (outlined in dashed lines in FIG. 5) steps ofoperation when at least one of the antenna coils 126 and 128 receives RFsignals to be processed by the micro-computer before, during, or afterprocessing of CNT_IO (around step 156 of FIG. 5). In FIG. 5,contact-less operation is assigned higher priority over contactoperation. Thus, if RF_VDD becomes available (at step 160 of FIG. 5),shortly before, during, or shortly after processing of CNT_IO (aroundstep 156 of FIG. 5) via interrupt of (or polling by) the micro-computer136, processing of CNT_IO (at step 156 of FIG. 5) is prematurelyaborted, and steps 144, 146 , 148, and 150 are performed instead toprocess the RF_IO.

Because the data register 136 is reset at step 146 , results fromprevious processing of CNT_IO (at step 156 of FIG. 5) aredisadvantageously lost. If RF_VDD is not available (at step 160 of FIG.5) during such interrupt/polling, the micro-computer 136 continues withprocessing of CNT_IO (at step 156 of FIG. 5).

Alternatively, FIG. 6 shows a flowchart of steps for operation of the ICchip 130 when contact operation is assigned higher priority overcontact-less operation. In that case, upon power-on (at step 162 of FIG.6) of the IC chip 130, the signal selection unit 134 checks foravailability of CNT_VDD from the contact bank 124 (at step 164 of FIG.6).

If such CNT_VDD is available (at step 164 of FIG. 6), the signalselection unit 134 selects signals received by the contact bank 124 tobe processed by the micro-computer 136. Thus, CNT_VDD is selected tosupply power to the micro-computer 136 (at step 166 of FIG. 6), and thedata register 138 is reset (at step 168 of FIG. 6). Contact data(CNT_IO) received via the contact bank 124 is then processed by themicro-computer 136 (at step 170 of FIG. 6) before power-off (at step 172of FIG. 6) of the IC chip 130.

Further referring to FIG. 6, if CNT_VDD is not available (at step 164 ofFIG. 6), the signal selection unit 134 selects signals received via atleast one of the antenna coils 126 and 128 to be processed by themicro-computer 136. Thus, RF_VDD is selected to supply power to themicro-computer 136 (at step 174 of FIG. 6), and the data register 138 isreset (at step 176 of FIG. 6). In addition, RF_IO is processed by themicro-computer 136 (at step 178 of FIG. 6) before power-off (at step 180of FIG. 6) of the IC chip 130.

FIG. 6 also illustrates (outlined in dashed lines in FIG. 6) steps ofoperation if the contact bank 124 receives signals to be processed bythe micro-computer before, during, or after processing of RF_IO (aroundstep 178 of FIG. 6). In FIG. 6, contact operation is assigned higherpriority over contact-less operation. Thus, if CNT_VDD becomes available(at step 182 of FIG. 6), shortly before, during, or shortly afterprocessing of RF_IO (around step 178 of FIG. 6) via interrupt of (orpolling by) the micro-computer 136, processing of RF_IO (at step 178 ofFIG. 6) is prematurely aborted, and steps 166, 168, 170, and 172 areperformed instead to process the CNT_IO.

Because the data register 136 is reset at step 168, results fromprevious processing of RF_IO (at step 178 of FIG. 6) aredisadvantageously lost. If CNT_VDD is not available (at step 182 of FIG.6) during such interrupt/polling, the micro-computer 136 continues withprocessing of RF_IO (at step 178 of FIG. 6).

In either FIG. 5 or FIG. 6 of the prior art, processing of CNT_IO(contact data) or RF_IO (contact-less data) may be prematurely aborted,and the results of such processing are disadvantageously lost. Inaddition, if both RF_IO and CNT_IO are simultaneously received at thechip card 122, the micro-computer completely ignores and does notprocess one of RF_IO and CNT_IO depending on the assigned prioritybetween contact and contact-less operations. However, any of such dataavailable to the chip card may be desired to be processed for multiplefunctionality of the chip card.

SUMMARY OF THE INVENTION

Accordingly, a chip card in a general aspect of the present inventionprocesses what-ever combination of contact data (CNT_IO) andcontact-less data (RF_IO) is received by the chip card.

In one embodiment of the present invention, a chip card includes amicro-computer, a contact interface for transmission of data between acontact bank and the micro-computer, and a contact-less interface fortransmission of data between at least one antenna and themicro-computer. The micro-computer is adapted to simultaneously receivecontact data from the contact interface and contact-less data from thecontact-less interface. The micro-computer is adapted to process thereceived contact and contact-less data.

In another embodiment of the present invention, the micro-computer isadapted to receive and process what-ever combination of contact data andcontact-less data is derived and sent from the contact interface and thecontact-less interface. In an example embodiment, the contact data andthe contact-less data are simultaneously sent to the micro-computer fromthe contact interface and the contact-less interface, respectively.

In a further embodiment of the present invention, the micro-computer isadapted to send at least one control signal to dictate whether each ofthe contact data and the contact-less data is sent to themicro-computer.

In yet another embodiment of the present invention, a chip card includesa micro-computer, a contact interface for deriving a contact biasvoltage from a signal on a contact bank, and a contact-less interfacefor deriving a contact-less bias voltage from a signal on at least oneantenna. In addition, the chip card includes a power voltage selectorfor selecting the contact bias to be supplied to the micro-computerwhen-ever the contact bias voltage is available. The contact biasvoltage is selected over the contact-less bias voltage because thecontact bias voltage is more stable.

In such an embodiment of the present invention, the power voltageselector selects the contact-less bias voltage to be supplied to themicro-computer when the contact-less bias voltage is available and whenthe contact bias voltage is not available. In that case, the powervoltage selector switches to select the contact bias voltage to besupplied to the micro-computer when-ever the contact bias voltagebecomes available. In addition, the power voltage selector selects thecontact bias voltage to be supplied to the micro-computer when both thecontact bias voltage and the contact-less bias voltage are available.

In an example embodiment of the present invention, the power voltageselector includes a first switch that turns on to couple the contactbias voltage to the micro-computer when-ever the contact bias voltage isavailable. In addition, a second switch turns on to couple thecontact-less bias voltage to the micro-computer when the contact-lessbias voltage is available and when the contact bias voltage is notavailable.

In this manner, the chip card processes what-ever combination of contactdata (CNT_IO) and contact-less data (RF_IO) is available to the chipcard for multiple functionality. For example, contact data may beprocessed for making a phone call simultaneously with processingcontact-less data for making a payment.

These and other features and advantages of the present invention will bebetter understood by considering the following detailed description ofthe invention which is presented with the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a block-diagram of a chip card of the contact type,according to the prior art;

FIG. 2 shows a block-diagram of a chip card of the contact-less type,according to the prior art;

FIG. 3 shows a block-diagram of a chip card of the combined type,according to the prior art;

FIG. 4 shows components within an IC chip of the chip card of FIG. 3,according to the prior art;

FIG. 5 shows a flowchart of steps for operation of the IC chip of FIG. 4when contact-less operation is assigned higher priority over contactoperation, according to the prior art;

FIG. 6 shows a flowchart of steps for operation of the IC chip of FIG. 4when contact operation is assigned higher priority over contact-lessoperation, according to the prior art;

FIG. 7 shows a chip card of the combined type for processing any ofcontact data and contact-less data received by the chip card formultiple functionality, according to an embodiment of the presentinvention;

FIG. 8 shows a flowchart of steps during operation of the chip card ofFIG. 7, according to an embodiment of the present invention;

FIG. 9 illustrates use of the chip card of FIG. 7 in interaction withexample contact and contact-less terminals, according to an embodimentof the present invention;

FIG. 10 shows modification of the chip card of FIG. 7 such that amicro-computer of the chip card dictates which of contact andcontact-less interfaces are activated, according to another embodimentof the present invention; and

FIG. 11 shows a block diagram of alternative components for a chip cardof the combined type, according to another embodiment of the presentinvention.

The figures referred to herein are drawn for clarity of illustration andare not necessarily drawn to scale. Elements having the same referencenumber in FIGS. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 refer to elementshaving similar structure and function.

DETAILED DESCRIPTION

Referring to an embodiment of the present invention in FIG. 7, a chipcard 200 of the combined type includes both a contact bank 202 having aplurality of contacts 204 and at least one antenna coil (a first antennacoil 206 and a second antenna coil 208 in the example of FIG. 7). Thecontact bank 202 and the first and second antenna coils 206 and 208 arecoupled to an IC (integrated circuit) chip 210 (outlined in dashed linesin FIG. 7).

The contact bank 202, the antenna coils 206 and 208, and the IC chip 210are formed onto a substrate (not shown in FIG. 7) for the chip card 200.The substrate for the chip card 200 typically has a shape similar to acredit-card, and physical placement of the contact bank 202, the antennacoils 206 and 208, and the IC chip 210 onto the substrate is dictated byISO standards as known to one of ordinary skill in the art.

The IC chip 210 includes a micro-computer 212 (outlined in dashed linesin FIG. 7) and a contact interface 214 coupled between the contact bank202 and the micro-computer 212. The contact interface 214 receives thesignals from the contacts of the contact bank 202 and derives contactdata (CNT_IO) and a contact bias voltage (CNT_VDD) from such signals.Implementation of such a contact interface 214, individually, is knownto one of ordinary skill in the art.

The IC chip 210 further includes a contact-less interface 216 coupledbetween the antenna coils 206 and 208 and the micro-computer 212. Thecontact-less interface 216 receives an RF (radio frequency) signal fromat least one of the antenna coils 206 and 208 and derives contact-lessdata (RF_IO) and a contact-less bias voltage (RF_VDD) from such asignal. Implementation of such a contact-less interface 216,individually, is known to one of ordinary skill in the art.

Note that the RF (radio frequency) designation is used herein to referto contact-less signals. However, the present invention may be practicedfor any type of contact-less signals having any frequency components (inaddition to just the example of the radio frequency range) received bythe antenna coils 206 and 208.

The IC chip 210 further includes a power voltage selector 218 (outlinedin dashed lines in FIG. 7) that inputs CNT_VDD from the contactinterface 214 and RF_VDD from the contact-less interface 216 and outputsa selected bias voltage (VDD) to the micro-computer 212. The powervoltage selector 218 is comprised of a first PMOSFET 220 having a sourcecoupled to CNT_VDD, a gate coupled to an output of an inverter 222, anda drain coupled to a drain of a second PMOSFET 224. The second PMOSFET224 has a source coupled to RF_VDD and has a gate coupled to CNT_VDD.The drains of the PMOSFETs 220 and 224 are coupled together to themicro-computer 212.

The micro-computer 212 includes a contact data register 226 coupled tothe contact interface 214, and includes a contact-less data register 228coupled to the contact-less interface 216. The contact data register 226and the contact-less data register 228 are coupled to a data processor230 of the micro-computer 212. The micro-computer 212 further includes amemory device 232 coupled to the data processor 230 for storingsequences of instructions to be executed by the data processor 230. Thedata processor 230 executes such sequences of instructions to performthe steps of the flowchart of FIG. 8.

Operation of the chip card 200 is now described in reference to theflowchart of FIG. 8. Upon power-on (at step 302 of FIG. 8) of the ICchip 210, the power voltage selector 218 operates depending on which ofthe contact bias voltage (CNT_VDD) and the contact-less bias voltage(RF_VDD) are available (at step 304 of FIG. 8). If the contact bank 202receives signals from a contact based terminal, the contact interface214 derives CNT_VDD from such signals such that CNT_VDD is available asa high voltage level to the power voltage selector 218. If at least oneof the antenna coils 206 and 208 receives signals from a contact-lessbased terminal, the contact-less interface 216 derives RF_VDD from suchsignals such that RF_VDD is available as a high voltage level to thepower voltage selector 218.

Consider the case when only CNT_VDD is available as a high voltage levelto the power voltage selector 218 (at step 304 of FIG. 8). In that case,the contact bank 202 receives signals to be processed by the IC chip210, while the antenna coils 206 and 208 do not receive any signals tobe processed. Further in that case, the first PMOSFET 220 acts as afirst switch that is turned on (while the second PMOSFET 224 is turnedoff) to select CNT_VDD as the bias voltage VDD for supplying power tothe micro-computer 212 (at step 306 of FIG. 8).

The contact data register 226 and the contact-less data register 228 arereset (at step 308 of FIG. 8). Subsequently, the contact data register226 receives and stores the contact data (CNT_IO) derived by the contactinterface 214 (at step 310 of FIG. 8). The data processor 230 thenprocesses such CNT_IO (at step 310 of FIG. 8) before power-off (at step312 of FIG. 8) of the IC chip 210.

FIG. 8 also illustrates (outlined in dashed lines in FIG. 8) steps ofoperation when at least one of the antenna coils 206 and 208 receivessignals to be processed before, during, or after processing of CNT_IO(around step 310 of FIG. 8). RF_VDD may become available (at step 314 ofFIG. 8), shortly before, during, or shortly after processing of CNT_IO(around step 310 of FIG. 8) via interrupt of (or polling by) themicro-computer 212. In that case, the contact-less data (RF_IO) derivedby the contact-less interface 216 is received and stored by thecontact-less data register 228 (at step 316 of FIG. 8).

The data processor 230 then processes such RF_IO (at step 316 of FIG.8), and the data processor 230 then returns to continue the processingof CNT_IO (at step 310 of FIG. 8). In this manner, the CNT_IO previouslyreceived at step 310 is not lost, and both CNT_IO and RF_IO areprocessed by the micro-computer 212 (with steps 310, 314, and 316 inFIG. 8). If RF_VDD is not available during the interrupt/polling (atstep 314 of FIG. 8), the data processor 230 simply completes processingof CNT_IO (at step 310 of FIG. 8) before power-off (at step 312 of FIG.8) of the IC chip 210.

In addition, even when RF_VDD becomes available (at step 314 of FIG. 8),the power voltage selector 218 continues to select CNT_VDD to supplypower to the micro-computer 212. CNT_VDD is a more stable voltage sourcethan RF_VDD which is more prone to noise. Thus, the power voltageselector 218 advantageously continues to select CNT_VDD to supply powerto the micro-computer 212 even when RF_VDD becomes available (at step314 of FIG. 8). Just the contact-less data (RF_IO) that becomesavailable is processed by the data processor 230 (at step 316 of FIG.8), before power-off of the IC chip 210 (at step 312 of FIG. 8).

Alternatively, consider the case when only RF_VDD is available as a highvoltage level to the power voltage selector 218 (at step 304 of FIG. 8).In that case, at least one of the antenna coils 206 and 208 receivessignals to be processed by the IC chip 210, while the contact bank 202does not receive any signals to be processed. Further in that case, thesecond PMOSFET 224 acts as a second switch that is turned on (while thefirst PMOSFET 220 is turned off) to select RF_VDD as the bias voltageVDD for supplying power to the micro-computer 212 (at step 318 of FIG.8).

The contact data register 226 and the contact-less data register 228 arereset (at step 320 of FIG. 8). Subsequently, the contact-less dataregister 228 receives and stores the contact-less data (RF_IO) derivedby the contact-less interface 216 (at step 322 of FIG. 8). The dataprocessor 230 then processes such RF_IO (at step 322 of FIG. 8) beforepower-off (at step 324 of FIG. 8) of the IC chip 210.

FIG. 8 also illustrates (outlined in dashed lines in FIG. 8) steps ofoperation when the contact bank 202 receives signals to be processedbefore, during, or after processing of RF_IO (around step 322 of FIG.8). CNT_VDD may become available (at step 326 of FIG. 8), shortlybefore, during, or shortly after processing of RF_IO (around step 322 ofFIG. 8) upon interrupt of (or polling by) the micro-computer 212. Inthat case, the power voltage selector 218 switches to select CNT_VDD tosupply power to the micro-computer 212 (at step 328 of FIG. 8).

When CNT_VDD becomes available as a high voltage level, the firstPMOSFET 220 turns on, and the second PMOSFET 224 turns off such thatCNT_VDD is coupled to the micro-computer 212. CNT_VDD is a more stablevoltage source than RF_VDD which is more prone to noise. Thus, the powervoltage selector 218 advantageously switches to select CNT_VDD to supplypower to the micro-computer 212 when CNT_VDD becomes available (at step328 of FIG. 8).

In addition, the contact data (CNT_IO) derived by the contact interface214 is received and stored by the contact data register 226 (at step 330of FIG. 8). The data processor 230 then processes such CNT_IO (at step330 of FIG. 8), and the data processor 230 then returns to continue theprocessing of RF_IO (at step 322 of FIG. 8).

In this manner, the RF_IO previously received at step 322 is not lost,and both CNT_IO and RF_IO are processed by the micro-computer 212 (withsteps 322, 326, and 330 in FIG. 8). In addition, as soon as CNT_VDDbecomes available (at step 326 of FIG. 8) during processing of RF_IO(around step 322 of FIG. 8), the power voltage selector 218advantageously switches to select the more stable CNT_VDD to supplypower to the micro-computer 212 (at step 328 of FIG. 8). If CNT_VDD isnot available during the interrupt/polling (at step 326 of FIG. 8), thedata processor 230 simply completes processing of RF_IO (at step 322 ofFIG. 8) before power-off (at step 324 of FIG. 8) of the IC chip 210.

Finally, consider the case when both RF_VDD and CNT_VDD are available ashigh voltage levels to the power voltage selector 218 (at step 304 ofFIG. 8). In that case, both the contact bank 202 and at least one of theantenna coils 206 and 208 simultaneously receive signals to be processedby the IC chip 210. Further in that case, the first PMOSFET 220 isturned on while the second PMOSFET 224 is turned off to select CNT_VDDas the bias voltage for supplying power to the micro-computer 212 (atstep 332 of FIG. 8).

The contact data register 226 and the contact-less data register 228 arereset (at step 334 of FIG. 8). Subsequently, the contact data register226 receives and stores the contact data (CNT_IO) derived by the contactinterface 214, while the contact-less data register 228 receives andstores the contact-less data (RF_IO) derived by the contact-lessinterface 216 (at step 336 of FIG. 8). The data processor 230 thenprocesses such CNT_IO and RF_IO (at step 336 of FIG. 8) before power-off(at step 338 of FIG. 8) of the IC chip 210.

In this manner, both CNT_IO and RF_IO are simultaneously sent to themicro-computer 212 that simultaneously receives and stores such CNT_IOand RF_IO into the contact and contact-less data registers 226 and 228,respectively. The data processor 230 then processes such CNT_IO andRF_IO. In addition, when both CNT_VDD and RF_VDD are simultaneouslyavailable, the power voltage selector 218 advantageously selects themore stable CNT_VDD to supply power to the micro-computer 212.

With such operation of the IC chip 210 according to the flowchart ofFIG. 8, any of the contact data (CNT_IO) and the contact-less data(RF_IO) derived by the contact and contact-less interfaces 214 and 216is received and processed by the micro-computer 212. In contrast to theprior art, such data are not ignored, even when such data are sentsimultaneously to the micro-computer 212. In addition, processing ofsuch data is not aborted prematurely since the micro-computer 212 isadapted to process both of such data CNT_IO and RF_IO received at anytime.

Thus, with such operation of the IC chip 210 according to the flowchartof FIG. 8, the micro-computer 212 is adapted to receive and processwhat-ever combination of CNT_IO and RF_IO is available at a time to theIC chip 210. Referring to FIG. 8, the micro-computer 212 receives andprocesses just the CNT_IO when only the CNT_IO is available to the ICchip 210. Alternatively, the micro-computer 212 receives and processesjust the RF_IO when only the RF_IO is available to the IC chip 210.Finally, the micro-computer receives and processes CNT_IO and RF_IO whenboth are available simultaneously to the IC chip 210.

In contrast, the prior art chip card of the combined type processes onlyone of the RF_IO or CNT_IO at a time depending on the assigned prioritybetween processing RF_IO versus CNT_IO, even when both are available.Thus, in the prior art chip card of the combined type, RF_IO or CNT_IOis lost or ignored when both become available.

Furthermore, the power voltage selector 218 advantageously selects themore stable CNT_VDD to supply power to the micro-computer 212 when-everCNT_VDD is available. Thus, the power voltage selector 218 selects theless stable RF_VDD to supply power to the micro-computer 212 whenCNT_VDD is not available and when RF_VDD is available.

FIG. 9 illustrates an application of the chip card 200 of FIG. 7 for anexample contact terminal 342 that is a mobile phone and an examplecontact-less terminal 344 that is for making a payment. The chip card200 is installed onto the mobile phone 342 such that the contact bank202 of the chip card 200 makes contact with the mobile phone 342. Inthat case, the micro-computer 212 processes CNT_IO from the mobile phone342 to keep track of phone calls made using the mobile phone 342. Thepayment terminal 344 includes a terminal antenna 346 for transmission ofsignals to/from at least one of the antenna coils 206 and 208.

While a person is using the mobile phone 342 for making a phone call,the person may desire to make a payment to the payment terminal 344using the chip card 200. For example, the payment terminal 344 may beused to make automatic payment at a subway station. While the person isusing the mobile phone 342 to make a phone call, the person maysimultaneously be walking into the subway station and may wish to makean automatic payment to the payment terminal 344 for using the subwaystation. The chip card 200 of the present invention allows suchsimultaneous functionalities by processing any of the contact data(CNT_IO ) for making the phone call with the mobile phone 342, and thecontact-less data (RF_IO) for making the automatic payment with thepayment terminal 344.

The foregoing is by way of example only and is not intended to belimiting. For example, the RF (radio frequency) designation is usedherein to refer to contact-less signals. However, the present inventionmay be practiced for any type of contact-less signals having anyfrequency components (in addition to just the example of the radiofrequency range) received by the antenna coils 206 and 208. In addition,the components illustrated and described herein are by way of exampleonly. For example, the data registers 226 and 228 may be implementedwith any types of data storage devices, and any type of switchingelements may be used for the PMOSFETs 220 and 224. Furthermore, thecomponents illustrated and described herein for an example embodiment ofthe present invention may be implemented with any combination ofhardware and/or software and in discrete and/or integrated circuits.

Additionally, the chip card 200 may also include additional featuresfrom those described herein. For example, FIG. 10 illustrates analternative chip card 350 that has an IC chip 352 modified from that ofthe chip card 200 of FIG. 7. A micro-computer 354 in FIG. 10 has a dataprocessor 356 and a memory device 358 that are modified from that of thechip card 200 of FIG. 7. In addition, a contact interface 360 and acontact-less interface 362 in FIG. 10 are modified from that of the chipcard 200 of FIG. 7.

When the data processor 356 executes sequences of instructions storedwithin the memory device 358 in FIG. 10, the data processor 356 has thefeature of sending a contact control signal (CNT_CONTROL) for activatingor deactivating the contact interface 360. In addition, the dataprocessor 356 has the feature of sending a contact-less control signal(RF_CONTROL) for activating or deactivating the contact-less interface362.

When CNT_CONTROL indicates that the contact interface 360 isdeactivated, the contact interface 360 is adapted to ignore any signalsreceived by the contact bank 202. Thus in that case, contact data(CNT_IO) is not sent to the micro-computer 354, and the contact biasvoltage (CNT_VDD) is not generated for the power voltage selector 218.Similarly, when RF_CONTROL indicates that the contact-less interface 362is deactivated, the contact-less interface 362 is adapted to ignore anysignals received by the antenna coils 206 and 208. Thus in that case,contact-less data (RF_IO) is not sent to the micro-computer 354, and thecontact-less bias voltage (RF_VDD) is not generated for the powervoltage selector 218.

When CNT_CONTROL and RF_CONTROL indicate that the contact interface 360is deactivated while the contact-less interface 362 is activated, thechip card performs the steps 302, 318, 320, 322, and 324 of FIG. 8 forprocessing just the contact-less data (RF_IO). Alternatively, whenCNT_CONTROL and RF_CONTROL indicate that the contact-less interface 362is deactivated while the contact interface 360 is activated, the chipcard performs the steps 302, 306, 308, 310, and 312 of FIG. 8 forprocessing just the contact data (CNT_IO).

Finally, when CNT_CONTROL and RF_CONTROL indicate that both of thecontact interface 360 and the contact-less interface 362 are activated,the chip card performs all of the steps of FIG. 8 for processingwhat-ever combination of the contact data (CNT_IO) and the contact-lessdata (RF_IO) is received at the chip card 350. In this manner, the chipcard 350 provides additional flexibility by being programmable forselection of which of the contact data (CNT_IO) and the contact-lessdata (RF_IO) is sent to the micro-computer 354 for processing.

FIG. 11 shows another alternative chip card 370 for handlingcontact-less (RF) signals received at the antenna coils 206 and 208. Acontact-less interface 372 includes a RF_VDD generator 374 that derivesthe contact-less bias voltage (RF_VDD) from such RF signals. Thecontact-less interface 372 also includes a RF_IO extractor 376 thatderives the contact-less data (RF_IO) from such RF signals.Implementation for each of the RF_VDD generator 374 and the RF_IOextractor 376 individually is known to one of ordinary skill in the art.

RF_IO derived by the RF_IO extractor 376 is sent to a micro-computer 378that includes a data processor 380 coupled to a contact-less dataregister 382 and a bus 384. In addition, the data processor 380 iscoupled to a VDD status flag register 386 and a control register 388 viathe bus 384. The contact-less data register 382 is coupled to an outputof an AND gate 390 having as inputs an RF_CONTROL signal from thecontrol register 388 and RF_IO from the RF_IO extractor 376.

The chip card 370 also includes a power voltage selector 392 that inputsRF_VDD from the RF_VDD generator 374 and an external bias voltage(EX_VDD) generated by an external VDD source 394. Generally, the presentinvention is practiced for any type of voltage source 394 that generatesan alternative bias voltage EX_VDD that is more stable than RF_VDD. Thepower voltage selector 392 includes a comparator 396 that inputs RF_VDD(at a positive input terminal) and EX_VDD (at a negative inputterminal). The output of the comparator 396 is coupled to an input of aninverter 398 and to a gate of a first PMOSFET 400. The first PMOSFET 400has a source coupled to EX_VDD and has a drain coupled to a drain of asecond PMOSFET 402. The second PMOSFET 402 has a gate coupled to theoutput of the inverter 398 and has a source coupled to RF_VDD.

The power voltage selector 392 outputs a bias voltage VDD to an internalvoltage generator 404 that uses VDD to supply power to themicro-computer 378. The power voltage selector 392 operates to selectEX_VDD from the external voltage source 394 to be output as VDDwhen-ever EX_VDD is available, irrespective of the availability ofRF_VDD. Such a power voltage selector 392 is advantageous when EX_VDD isa more stable voltage than RF_VDD.

The power voltage selector 392 in FIG. 11 is generalized from that ofFIGS. 7 and 10 because EX_VDD is from any voltage source 394 thatprovides an alternative bias voltage EX_VDD that is more stable thanRF_VDD (in addition to the example CNT_VDD received at a contact bank).Similar to FIGS. 7 and 9, the power voltage selector 392 of FIG. 11selects RF_VDD from the RF_VDD generator 374 to be output as VDD ifEX_VDD is not available and if RF_VDD is available, since RF_VDD is notas stable as EX_VDD.

In FIG. 11, the internal voltage generator 404 may simply use VDD fromthe power voltage selector 392 to bias the micro-computer 378.Alternatively, the internal voltage generator 404 may provide themicro-computer 378 with a voltage level that is further boosted fromVDD.

The voltage level of RF_VDD as stored in the VDD status flag register386 indicates to the data processor 380 whether RF signals are receivedby the antenna coils 206 and 208. The data processor 380 may use suchindication from the VDD status flag register 386 in deciding a priorityfor processing contact data (CNT_IO) and contact-less data (RF_IO).

In addition, the data processor 380 sends a contact-less control signal(RF_CONTROL) stored within a control register 388 to indicate whetherthe data processor 380 is to process contact-less data (RF_IO). IfRF_CONTROL indicates that the data processor 380 is to process RF_IO,the AND gate 390 passes RF_IO generated by the RF_IO extractor 376 tothe contact-less data register 382. Thereafter, the data processor 380processes RF_IO stored in the contact-less data register 382. On theother hand, if RF_CONTROL indicates that the data processor 380 is notto process RF_IO, the AND gate 390 prevents sending of RF_IO to thecontact-less data register 382, and the data processor 380 does notprocess such RF_IO.

FIG. 11 illustrates an alternative chip card 370 for handling RF signalsreceived by at least one of the antenna coils 206 and 208. Thefunctionality for handling RF signals received by at least one of theantenna coils 206 and 208 is similar for FIGS. 10 and 11. However, thecomponents and the configuration of the components in FIGS. 10 and 11are different. The present invention may also be practiced with othervarious possible implementations, aside from the example embodiments ofFIGS. 7, 10, and 11.

The present invention is limited only as defined in the following claimsand equivalents thereof.

1. A mobile phone comprising: a chip card including: a contact bank formaking contact with the mobile phone; a micro-computer; a contactinterface for transmission of contact data between the contact bank andthe micro-computer; a contact-less interface coupled to a contact-lessterminal and for transmission of contact-less data between at least oneantenna and the micro-computer; a first switch that turns on to couple acontact bias voltage from the contact interface to the micro-computerwhenever the contact bias voltage is available; and a second switch thatturns on to couple a contact-less bias voltage from the contact-lessinterface to the micro-computer when the contact-less bias voltage isavailable and when the contact bias voltage is not available, whereinthe first switch is configured to be turned on for coupling theavailable contact bias voltage to the micro-computer and wherein thesecond switch is configured to be turned off, even while themicro-computer receives and processes the contact-less data from thecontact-less interface.
 2. The mobile phone of claim 1, wherein each ofthe first and second switches is comprised of a field effect transistor.3. A mobile phone comprising: a chip card including: a contact bank formaking contact with the mobile phone and for transmission of contactdata between the chip card and the mobile phone; at least one antennafor transmission of contact-less data between the chip card and aterminal; a first data register for storing one of the contact andcontact-less data upon reception; means for processing the stored one ofthe contact and contact-less data; means for halting processing of thestored one of the contact and contact-less data upon detecting receptionof the other one of the contact and contact-less data; means forprocessing the other one of the contact and contact-less data that isnewly received; and means for resuming processing of the one of thecontact and contact-less data stored in the first data register afterprocessing the other one of the contact and contact-less data.
 4. Themobile phone of claim 3, wherein the chip card further comprises asecond data register for storing the other one of the contact andcontact-less data that is newly received.
 5. The mobile phone of claim3, wherein the chip card further comprises means for selecting a contactbias voltage from the contact bank to supply power to the chip card andfor uncoupling a contact-less bias voltage derived from a signal at theantenna, whenever the contact bias voltage is available.
 6. The mobilephone of claim 5, wherein the chip card further comprises means forselecting the contact-less bias voltage to supply to the chip card whenthe contact-less bas voltage is available and when the contact biasvoltage is not available.
 7. The mobile phone of claim 3, wherein thechip card further comprises means for selecting processing just one ofthe contact data and the contact-less data.
 8. A mobile phonecomprising: a chip card configured to make contact with the mobilephone, the chip card including: a micro-computer; a contact-lessinterface for deriving a contact-less bias voltage and contact-less datafrom a signal on at least one antenna; a voltage source for generatingan alternative bias voltage that is more stable than the contact-lessbias voltage; and a power voltage detector including: a first switchthat turns on to couple the alternative bias voltage to themicro-computer whenever the alternative bias voltage is available; and asecond switch that turns on to couple a contact-less bias voltage to themicro-computer when the contact-less bias voltage is available and whenthe alternative bias voltage is not available, wherein the first switchis configured to be turned on for coupling the available alternativebias voltage to the micro-computer and wherein the second switch isconfigured to be turned off, even while the micro-computer receives andprocesses the contact-less data from the contact-less interface.
 9. Themobile phone of claim 8, wherein the voltage source is a contactinterface for deriving the alternative bias voltage as a contact biasvoltage from a signal on a contact bank.
 10. The mobile phone of claim8, wherein each of the first and second switches is comprised of a fieldeffect transistor.
 11. A mobile phone comprising: a chip card including:a micro-computer; a contact interface for transmission of contact databetween a contact bank and the micro-computer, wherein the contact bankis in contact with the mobile phone; a first register data register; anda contact-less interface for transmission of contact-less data betweenat least one antenna and the micro-computer, wherein the micro-computerincludes: a data processor; and a memory device having sequences ofinstructions stored thereon, and wherein execution of the sequences ofinstructions by the data processor causes the data processor to performthe steps of: storing one of the contact and contact-less data uponreception in the first data register; processing the one of the contactand contact-less data stored in the first data register; haltingprocessing of the one of the contact and contact-less data upondetecting reception of the other one of the contact and contact-lessdata; processing the other one of the contact and contact-less data thatis newly received; and resuming processing of the one of the contact andcontact-less data as stored in the first data register after processingthe other one of the contact and contact-less data.
 12. The mobile phoneof claim 11, wherein the chip card further comprises a second dataregister, wherein execution of the sequences of instructions by the dataprocessor causes the data processor to perform the further step ofstoring the other one of the contact and contact-less data that is newlyreceived in the second register.
 13. The mobile phone of claim 11,wherein execution of the sequences of instructions by the data processorcauses the data processor to perform the further step of detecting thereception of the other one of the contact and contact-less data byinterrupt or polling.